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Help with 971 wiring problem


 
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sprouticus
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Joined: 03 Oct 2012
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Location: MN

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PostPosted: Wed Oct 03, 2012 6:20 pm    Post subject: Help with 971 wiring problem Reply to specific post Reply with quote

I am working on a 971 for a friend.

I have switched it over to a 12 volt system with a one wire type alternator.

I set it up with the diagram in the link.

Last night I tried it and it seemed to work fine.
Well today I got the gas tank and radiator all set and tried to start it and get it running. I turned the key on and hit the starter button and the starter motor would not stop turning even after I stopped pushing the button, I turned the key off and it still kept turning, so I had to quickly disconnect the battery. So what am I doing wrong?
(Also I eliminated the amp light and used an amp meter instead.)
Thanks in advance.
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Larry NCKS
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Joined: 23 Dec 2001
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Location: Washington, KS/Lincoln, NE

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PostPosted: Wed Oct 03, 2012 6:32 pm    Post subject: Re: Help with 971 wiring problem Reply to specific post Reply with quote

diagram looks good, except I'd wire the lights to the B+ side of the terminal block and not the switched side. That has nothing to do with your problem, however.

Three posibilities I can think of. Starter button stuck on or solenoid stuck on or solenoid to starter switch wire shorted to ground somewhere.
 
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Royse
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Joined: 17 Jan 2011
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Location: Michigan

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PostPosted: Wed Oct 03, 2012 6:33 pm    Post subject: Re: Help with 971 wiring problem Reply to specific post Reply with quote

Sounds like the solenoid stuck.
Check if it has a push button on the bottom of it to manually engage.
If so, you can usually wiggle it and it will release.
I got a cheap one like this from TSC.
It stuck again later, so I ended up replacing it.
 
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awhtx
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Location: Lampasas, TX

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PostPosted: Wed Oct 03, 2012 6:47 pm    Post subject: Re: Help with 971 wiring problem Reply to specific post Reply with quote

Attempting to start an engine with a weak battery will sometimes cause the contacts inside the relay/solenoid to "weld" themselves in the closed position.
 
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sprouticus
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PostPosted: Wed Oct 03, 2012 8:06 pm    Post subject: Re: Help with 971 wiring problem Reply to specific post Reply with quote

Thanks for all the quick responses.

Everything is new, battery, solenoid, wiring, bat. cables, resistor, key switch, starter switch and all the gauges. (The tractor was a real mess.)
So yesterday it worked fine, hit the starter button and it turned over, when I released the button it stopped. Then today, augh! I wanted to pull my hair out.
I just went out to the shed and tried to reconnect the neg. cable to the battery, to see what would happen. Whoa, a big arc snapped at me, so I guess you were right about the solenoid being stuck.
So I looked at the package the solenoid came in. See the attached image.


CHINA?!

So I dug through my box of extra parts I have accumulated and found a good old U.S.A. made solenoid so I will put that on tomorrow and let you guys know it turns out.
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souNdguy
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PostPosted: Thu Oct 04, 2012 2:40 pm    Post subject: Re: Help with 971 wiring problem Reply to specific post Reply with quote

ditto what awhtx said.. weak bats can arc weld contacts in a solenoid.

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